Silver iDEA Citizen badge part two

I need help with the Citizen fortification badge bit. It says to pass the variable through escape tags and to sanitise the variable. I have put this but i dont know whats wrong with it:

$myFormData = $_POST['comments'];
$myFormData=escape_tags($myFormData)i
insertIntoDatabase($myFormData)

you have to replace the first line with the escape tag variable. Hope this helps